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And we begin to become a little bit more focused. >> the case hits home for dr. ralston. he's the father of two. one of them the same age as the victim. >> bloody fluid is present within the left chest space. i know what my 3-year-old can and can't do and her emotional reactions and her response to pain and fright. and so it obviously brings it a little bit closer to home in terms of what may have -- this child's final moments may have been. >> still, he maintains his professional composure. he has a job to do and a duty to the victim's family and to the investigators. >> we're doing a service...

Bit more focused. >> the case hits home for dr. ralston. he's the father of two. one of them the same age as the victim. >> bloody fluid is present within the left chest space. i know what my 3-year-old can and can't do and her emotional reactions and her response to pain and fright. and so it obviously brings it a little bit closer to home in terms of what may have -- this child's final moments may have been. >> still, he maintains his professional composure. he has a job to do and a duty to the victim's family and to the investigators. >> we're doing a service to a number of people by tellin...

Large heart. here is his cardiac silhouette. look at that. i mean, it takes up that whole chest space. huge heart. >> it doesn't take long to find the first clue. >> he's got pericardial adhesions too. oh, my goodness. look at that. >> he's got a huge heart. >> yeah. normal heart should weigh about 350 grams. since he's a relatively small person, i would expect his heart to weigh somewhere around -- normally around 300, 325. and to be about the size of a fist. the heart weighs 800. 800. >> but the heart is not the only medical problem she encounters.